1646145 has 24 divisors (see below), whose sum is σ = 2883816. Its totient is φ = 868608.

The previous prime is 1646143. The next prime is 1646147. The reversal of 1646145 is 5416461.

1646145 is a `hidden beast` number, since 1 + 646 + 14 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1646143) and next prime (1646147).

It can be written as a sum of positive squares in 4 ways, for example, as 5184 + 1640961 = 72^2 + 1281^2 .

It is not a de Polignac number, because 1646145 - 2¹ = 1646143 is a prime.

It is a super-2 number, since 2×1646145² = 5419586722050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1646143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6949 + ... + 7181.

It is an arithmetic number, because the mean of its divisors is an integer number (120159).

2^1646145 is an apocalyptic number.

1646145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1646145 is a deficient number, since it is larger than the sum of its proper divisors (1237671).

1646145 is a wasteful number, since it uses less digits than its factorization.

1646145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 398 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1646145 is about 1283.0218236647. The cubic root of 1646145 is about 118.0744765880.

The spelling of 1646145 in words is "one million, six hundred forty-six thousand, one hundred forty-five".